Turbo compressor and turbo refrigerating machine

ABSTRACT

A turbo compressor which is provided with a lubricant spray nozzle which is disposed to penetrate a housing and sprays a lubricant toward a bearing accommodated in the housing, and an external manifold which is detachably mounted on the housing and supports the lubricant spray nozzle outside of the housing is adopted.

TECHNICAL FIELD

The present invention relates to a turbo compressor and a turbo refrigerating machine.

Priority is claimed on Japanese Patent Application No. 2013-144575, filed on Jul. 10, 2013, the content of which is incorporated herein by reference.

BACKGROUND ART

As a refrigerating machine, a turbo refrigerating machine which is provided with a turbo compressor which compresses a refrigerant by rotating an impeller by an electric motor and discharges the compressed refrigerant is known. In the turbo compressor, a lubricant is supplied from an oil tank to a sliding site such as a bearing of a rotating shaft of the electric motor or a bearing of a rotating shaft of the impeller.

Patent Document 1 discloses a turbo compressor provided with a lubricant supply device which supplies a lubricant stored in an oil tank to a sliding site. The lubricant supply device has an oil feeding system which leads the lubricant to the vicinity of the sliding site by connecting a plurality of pipes in the interior of a housing and supplies the lubricant by approaching the sliding site through a drilled hole or the like formed in the housing by machining (refer to FIGS. 2 and 3 of Patent Document 1).

Patent Document 2 discloses a lubricant spray nozzle which supplies, in a gear case in which a gear and a pinion which transmit a rotating force from a driver of a turbo compressor to a first impeller and a second impeller are accommodated, a lubricant to an engagement portion of the gear and the pinion. Although the lubricant spray nozzle is not composed of a plurality of pipes which are connected to each other, as in Patent Document 1, the lubricant spray nozzle extends to the vicinity of the engagement portion through a hole provided in a housing, as in Patent Document 1 (refer to Paragraph [0014] and FIGS. 1 and 2 of Patent Document 2).

Patent Document 3 discloses an oil supply pipe which supplies a lubricant from a lubricant tank to a turbo compressor in a turbo refrigerating machine. However, a detailed configuration of the oil supply pipe is not disclosed therein (refer to Paragraph [0021] and FIGS. 1 and 2 of Patent Document 3).

CITATION LIST Patent Document

[Patent Document 1] Japanese Unexamined Patent Application, First Publication No. 2012-207666

[Patent Document 2] Japanese Unexamined Patent Application, First Publication No. 2003-328998

[Patent Document 3] Japanese Unexamined Patent Application, First Publication No. 2009-204260

SUMMARY OF INVENTION Technical Problem

In the oil feeding system of the related art in which the plurality of pipes are connected to each other, it takes time to perform complicated piping work in a narrow space of the inside of the housing, and in the oil feeding system of the related art in which machining is performed on the housing, it takes time to perform the machining of the thin and long drilled hole.

The present invention has been made in view of the above-described circumstances and has an object to provide a turbo compressor and a turbo refrigerating machine in which labor required for the assembly of an oil feeding system can be reduced.

Solution to Problem

According to a first aspect of the present invention, there is provided a turbo compressor including: a lubricant spray nozzle which is disposed to penetrate a housing and sprays a lubricant toward a sliding site accommodated in the housing; a support member which is detachably mounted on the housing and supports the lubricant spray nozzle outside of the housing; and a cover member which covers the sliding site in the interior of the housing and has a through-hole, in which the lubricant spray nozzle is disposed to pass through the through-hole.

In the first aspect of the present invention, the lubricant spray nozzle is installed by making the lubricant spray nozzle be supported on the support member which is detachably mounted on the outside of the housing and inserting the lubricant spray nozzle from the outside to the inside of the housing. In this manner, in the first aspect of the present invention, the installation of the lubricant spray nozzle can be completed only by inserting the lubricant spray nozzle from the outside of the housing, and therefore, labor required for the assembly of an oil feeding system can be reduced.

Further, the lubricant spray nozzle is inserted into the through-hole provided in the cover member which covers the sliding site in the interior of the housing, and thus the lubricant spray nozzle is installed. In this manner, in the first aspect of the present invention, the installation of the lubricant spray nozzle can be completed only by inserting the lubricant spray nozzle from the outside of the housing into the through-hole provided in the cover member in advance.

According to a second aspect of the present invention, in the first aspect, the housing is configured by connecting a compressor housing on which the support member is mounted and an electric motor housing on which the cover member is mounted, by a plurality of bolts, and the support member is provided with an eaves part which covers a head portion of at least one bolt among the plurality of bolts when the support member is mounted on the compressor housing.

In the second aspect of the present invention, it is possible to prevent the housing from being separated into the compressor housing and the electric motor housing if the lubricant spray nozzle is not removed. That is, in a case where the lubricant spray nozzle is disposed to penetrate the cover member, if an attempt to separate the housing is made in this state, there is a case where the lubricant spray nozzle is broken. For this reason in the second aspect of the present invention, the eaves part is provided at the support member and covers the head portion of the bolt connecting the compressor housing and the electric motor housing, whereby it becomes necessary to remove the lubricant spray nozzle from the cover member before separation of the housing, and thus breaking of the lubricant spray nozzle is prevented.

According to a third aspect of the present invention, in the second aspect, the eaves part has a hook shape and bumps against the electric motor housing in a connection release direction of the housing.

In the third aspect of the present invention, in a case where an attempt is made to separate the housing in a state where the lubricant spray nozzle is not removed, the eaves part bumps against the electric motor housing. For this reason, in the present invention, due to the impact of the eaves part, it is possible to remind a worker that the lubricant spray nozzle has not been removed from the cover member, and thus it is possible to more reliably prevent breaking of the lubricant spray nozzle.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the support member is a lubricant manifold having an oil supply passage which communicates with at least the lubricant spray nozzle.

In the fourth aspect of the present invention, the support member serves as the lubricant manifold, whereby the number of parts can be reduced and the oil feeding system is simplified, thereby contributing to a reduction in costs.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion weighs less than the body pipe portion.

In the fifth aspect of the present invention, the nozzle portion which receives a spray reaction force in the lubricant spray nozzle weighs less than the body pipe portion, and therefore, it is possible to reduce the generation of vibration due to the spray reaction force and thus appropriately supply the lubricant to the sliding site.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion is formed of a material having smaller specific gravity than the body pipe portion.

In the sixth aspect of the present invention, the nozzle portion which receives a spray reaction force in the lubricant spray nozzle has smaller specific gravity than the body pipe portion, and therefore, it is possible to reduce the generation of vibration due to the spray reaction force and thus appropriately supply the lubricant to the sliding site.

According to a seventh aspect of the present invention, there is provided a turbo refrigerating machine including: a condenser which liquefies a compressed refrigerant; an evaporator which evaporates the refrigerant liquefied by the condenser, thereby cooling a cooling object; and the turbo compressor according to any one of the first to sixth aspects, which compresses the refrigerant evaporated by the evaporator and supplies the compressed refrigerant to the condenser.

Advantageous Effects of Invention

According to the present invention, a turbo compressor and a turbo refrigerating machine are obtained in which labor required for the assembly of an oil feeding system can be reduced.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a system diagram of a turbo refrigerating machine in an embodiment of the present invention.

FIG. 2 is a diagram showing the disposition of a lubricant spray nozzle in the embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along line A-A in FIG. 2 and viewed from the direction of an arrow.

FIG. 4A is a perspective view showing the lubricant spray nozzle and an external manifold in the embodiment of the present invention.

FIG. 4B is a perspective view showing the lubricant spray nozzle and the external manifold in the embodiment of the present invention.

FIG. 5 is a perspective view showing the mounting state of the external manifold in the embodiment of the present invention.

FIG. 6 is a perspective view showing a cover member in the embodiment of the present invention.

FIG. 7A is a diagram for describing disassembly work and assembly work of a turbo compressor in the embodiment of the present invention.

FIG. 7B is a diagram for describing the disassembly work and the assembly work of the turbo compressor in the embodiment of the present invention.

FIG. 7C is a diagram for describing the disassembly work and the assembly work of the turbo compressor in the embodiment of the present invention.

FIG. 8 is a sectional view showing a lubricant spray nozzle in another embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system diagram of a turbo refrigerating machine 1 in an embodiment of the present invention.

In the turbo refrigerating machine 1 of this embodiment, for example, a chlorofluorocarbon is used as a refrigerant and cold water for air conditioning is set to be a cooling object. The turbo refrigerating machine 1 is provided with a condenser 2, an economizer 3, an evaporator 4, and a turbo compressor 5, as shown in FIG. 1.

The condenser 2 is connected to a gas discharge pipe 5 a of the turbo compressor 5 through a flow path R1. A refrigerant (a compressed refrigerant gas X1) compressed by the turbo compressor 5 is supplied to the condenser 2 through the flow path R1. The condenser 2 liquefies the compressed refrigerant gas X1. The condenser 2 is provided with a heat exchanger tube 2 a through which cooling water flows, and cools the compressed refrigerant gas X1 by heat exchange between the compressed refrigerant gas X1 and the cooling water.

The compressed refrigerant gas X1 is cooled and liquefied by heat exchange between itself and the cooling water, thereby becoming a refrigerant liquid X2, and the refrigerant liquid X2 accumulates in a bottom portion of the condenser 2. The bottom portion of the condenser 2 is connected to the economizer 3 through a flow path R2. An expansion valve 6 for decompressing the refrigerant liquid X2 is provided in the flow path R2. The refrigerant liquid X2 decompressed by the expansion valve 6 is supplied to the economizer 3 through the flow path R2. The economizer 3 temporarily stores the decompressed refrigerant liquid X2 and separates the refrigerant into a liquid phase and a gas phase.

A top portion of the economizer 3 is connected to an economizer connecting pipe 5 b of the turbo compressor 5 through a flow path R3. A gas-phase component X3 of the refrigerant separated out by the economizer 3 is supplied to a second compression stage 12 of the turbo compressor 5 through the flow path R3 without passing through the evaporator 4 and a first compression stage 11, and thus the efficiency of the turbo compressor 5 is increased. On the other hand, a bottom portion of the economizer 3 is connected to the evaporator 4 through a flow path R4. An expansion valve 7 configured to further decompress the refrigerant liquid X2 is provided in the flow path R4.

The refrigerant liquid X2 further decompressed by the expansion valve 7 is supplied to the evaporator 4 through the flow path R4. The evaporator 4 evaporates the refrigerant liquid X2 and cools cold water using the heat of vaporization. The evaporator 4 is provided with a heat exchanger tube 4 a through which the cold water flows, and causes the cooling of the cold water and the evaporation of the refrigerant liquid X2 by heat exchange between the refrigerant liquid X2 and the cold water. The refrigerant liquid X2 evaporates by taking in heat by heat exchange between itself and the cold water, thereby becoming a refrigerant gas X4.

A top portion of the evaporator 4 is connected to a gas suction pipe 5 c of the turbo compressor 5 through a flow path R5. The refrigerant gas X4 having evaporated in the evaporator 4 is supplied to the turbo compressor 5 through the flow path R5. The turbo compressor 5 compresses the refrigerant gas X4 having evaporated and supplies it to the condenser 2 as the compressed refrigerant gas X1. The turbo compressor 5 is a two-stage compressor which is provided with the first compression stage 11 which compresses the refrigerant gas X4, and the second compression stage 12 which further compresses the refrigerant compressed in one step.

An impeller 13 is provided in the first compression stage 11, an impeller 14 is provided in the second compression stage 12, and these impellers are connected by a rotating shaft 15. The turbo compressor 5 compresses the refrigerant by rotating the impellers 13 and 14 by an electric motor 10. Each of the impellers 13 and 14 is a radial impeller and has a blade which includes a three-dimensional twist (not shown) that radially leads out the refrigerant suctioned in an axial direction.

An inlet guide vane 16 for regulating the intake amount of the first compression stage 11 is provided in the gas suction pipe 5 c. The inlet guide vane 16 is made to be rotatable such that an apparent area from a flow direction of the refrigerant gas X4 can be changed. A diffuser flow path is provided around each of the impellers 13 and 14, and the refrigerant led out in a radial direction is compressed and increased in pressure in the diffuser flow path. Further, it is possible to supply the gas to the next compression stage by a scroll flow path provided around the diffuser flow path. An outlet throttle valve 17 is provided around the impeller 14 and is made so as to be able to control the discharge amount from the gas discharge pipe 5 a.

The turbo compressor 5 is provided with a hermetic type housing 20. The housing 20 is partitioned into a compression flow path space S1, a first bearing accommodation space S2, a motor accommodation space S3, a gear unit accommodation space S4, and a second bearing accommodation space S5. The housing 20 is connected so as to be able to be separated into a compressor housing 20 a and an electric motor housing 20 b.

The impellers 13 and 14 are provided in the compression flow path space S1. The rotating shaft 15 connecting the impellers 13 and 14 is provided to pass through the compression flow path space S1, the first bearing accommodation space S2, and the gear unit accommodation space S4. A bearing 21 supporting the rotating shaft 15 is provided in the first bearing accommodation space S2.

A stator 22, a rotor 23, and a rotating shaft 24 fixed to the rotor 23 are provided in the motor accommodation space S3. The rotating shaft 24 is provided to pass through the motor accommodation space S3, the gear unit accommodation space S4, and the second bearing accommodation space S5. A bearing 31 supporting the anti-load side of the rotating shaft 24 is provided in the second bearing accommodation space S5. A gear unit 25, bearings 26 and 27, and an oil tank 28 are provided in the gear unit accommodation space S4.

The gear unit 25 has a large-diameter gear 29 which is fixed to the rotating shaft 24, and a small-diameter gear 30 which is fixed to the rotating shaft 15 and engaged with the large-diameter gear 29. The gear unit 25 transmits a rotating force such that the rotational frequency of the rotating shaft 15 increases with respect to the rotational frequency of the rotating shaft 24 (the rotational speed of the rotating shaft 15 increases) The bearing 26 supports the rotating shaft 24. The bearing 27 supports the rotating shaft 15. The oil tank 28 stores a lubricant which is supplied to the respective sliding sites such as the bearings 21, 26, 27, and 31.

Sealing units 32 and 33 which seal the periphery of the rotating shaft 15 are provided in the housing 20 between the compression flow path space S1 and the first bearing accommodation space S2. Further, a sealing unit 34 which seals the periphery of the rotating shaft 15 is provided in the housing 20 between the compression flow path space S1 and the gear unit accommodation space S4. Further, a sealing unit 35 which seals the periphery of the rotating shaft 24 is provided in the housing 20 between the gear unit accommodation space S4 and the motor accommodation space S3. A sealing unit 36 which seals the periphery of the rotating shaft 24 is provided in the housing 20 between the motor accommodation space S3 and the second bearing accommodation space S5.

The oil tank 28 has an oil feed pump 37. The oil feed pump 37 is connected to an external manifold 38 (a support member, a lubricant manifold) through an oil supply passage R6. The external manifold 38 has an oil supply passage R7 which communicates with a lubricant spray nozzle 39, and an oil supply passage R8 which communicates with the second bearing accommodation space S5. The lubricant having passed through the oil supply passage R7 is supplied to the bearing 26, thereby ensuring the lubricity and the cooling of a sliding site with the rotating shaft 24, and then returns to the oil tank 28. Further, the lubricant having passed through the oil supply passage R8 is supplied to the bearing 31, thereby ensuring the lubricity and the cooling of a sliding site with the rotating shaft 24, and then returns to the oil tank 28 through a flow path R9.

Next, a structure related to the lubricant spray nozzle 39 which forms an oil feeding system of the turbo compressor 5 will be described with reference to FIGS. 2 to 7C.

FIG. 2 is a diagram showing the disposition of the lubricant spray nozzle 39 in the embodiment of the present invention. FIG. 3 is a cross-sectional view taken along line A-A in FIG. 2 and viewed from the direction of an arrow. FIGS. 4A and 4B are perspective views showing the lubricant spray nozzle 39 and the external manifold 38 in the embodiment of the present invention. FIG. 5 is a perspective view showing a state where the external manifold 38 in the embodiment of the present invention is mounted. FIG. 6 is a perspective view showing a cover member 40 in the embodiment of the present invention. FIGS. 7A, 7B, and 7C are diagrams showing disassembly work and assembly work of the turbo compressor 5 in the embodiment of the present invention.

As shown in FIG. 2, the lubricant spray nozzle 39 is disposed to penetrate the housing 20. The lubricant spray nozzle 39 is inserted in a horizontal direction toward the rotating shaft 24 with the large-diameter gear 29 fixed thereto. The cover member 40 which limits the scattering of oil droplets which are scraped up by the rotation of the large-diameter gear 29 is provided around the large-diameter gear 29. The cover member 40 is mounted on the electric motor housing 20 b of the housing 20, as shown in FIG. 1. The cover member 40 is provided so as to cover the rotating shaft 24, the bearing 26, and the large-diameter gear 29.

The cover member 40 has a flange portion 41, a groove portion 42, and a through-hole 43, as shown in FIG. 6. The flange portion 41 is a portion which is bolted to the electric motor housing 20 b (refer to FIG. 3). The groove portion 42 is a portion to avoid interfering with the small-diameter gear 30 (refer to FIG. 2).

The through-hole 43 is a portion in which the lubricant spray nozzle 39 is disposed to pass through it. The through-hole 43 has a size corresponding to the lubricant spray nozzle 39, and thus the lubricant spray nozzle 39 can be inserted into the through-hole 43 and a gap management is made such that the scattered oil droplets do not leak too much from a gap with the lubricant spray nozzle 39.

The lubricant spray nozzle 39 sprays the lubricant toward the bearing 26 accommodated in the housing 20, as shown in FIG. 3. The lubricant spray nozzle 39 has a body pipe portion 44 which is disposed to penetrate the housing 20, and a nozzle portion 45 which is connected to an end portion of the body pipe portion 44.

The body pipe portion 44 has a straight pipe structure and the lubricant can flow through the inside thereof. The nozzle portion 45 is welded to the end portion of the body pipe portion 44. The nozzle portion 45 has a jet orifice 45 a which is open obliquely toward the bearing 26. The nozzle portion 45 weighs less than the body pipe portion 44 as a countermeasure against vibration during spraying.

The housing 20 is composed of the compressor housing 20 a and the electric motor housing 20 b which are connected by a plurality of bolts 46 (refer to FIG. 5). A flange portion 20 a 1 of the compressor housing 20 a has a coupling structure with a flange portion 20 b 1 of the electric motor housing 20 b. The compressor housing 20 a and the electric motor housing 20 b are connected by performing alignment of the flange portion 20 a 1 and the flange portion 20 b 1 and fastening the peripheries thereof by the plurality of bolts 46. The bolt 46 is mounted from the electric motor housing 20 b, and a groove (in this embodiment, a hexagonal hole) for a screwdriver is provided in a head portion 46 a thereof.

Referring back to FIG. 3, a through-hole 20 a 2 in which the lubricant spray nozzle 39 is disposed to pass through it is formed in the compressor housing 20 a. The external manifold 38 which is detachably mounted on the compressor housing 20 a and supports the lubricant spray nozzle 39 outside of the compressor housing 20 a is provided around the through-hole 20 a 2. The external manifold 38 branches the oil supply passage R6 into the oil supply passage R7 which communicates with the lubricant spray nozzle 39 and the oil supply passage R8 which communicates with the second bearing accommodation space S5.

The external manifold 38 has a main body part 47 and an eaves part 48, as shown in FIGS. 4A and 4B.

The lubricant spray nozzle 39 is welded to the main body part 47. In this manner, in this embodiment, the external manifold 38 and the lubricant spray nozzle 39 are made to be an integral structure. Seal grooves 49, in each of which an O-ring (not shown) is disposed, are formed around the lubricant spray nozzle 39 in the main body part 47 and around a hole portion for the oil supply passage R6. A hard material is used for the O-ring, and thus the O-ring provides a metal touch. Therefore, the mounting posture (refer to FIG. 3) of the external manifold 38 with respect to the compressor housing 20 a is maintained to be constant.

A plurality of through-holes 50 are provided in the main body part 47. A bolt 51 (refer to FIG. 3) is inserted into each of the through-holes 50. In this manner, in this embodiment, the external manifold 38 is detachably mounted on the compressor housing 20 a by the bolts 51.

The eaves part 48 is bolted to the main body part 47. The eaves part 48 covers the head portion 46 a of at least one (in this embodiment, only one) bolt 46 among the plurality of bolts 46 when the external manifold 38 is mounted on the compressor housing 20 a, as shown in FIG. 5.

The eaves part 48 in this embodiment is formed of sheet metal having a width capable of covering the head portion 46 a of one bolt 46. The eaves part 48 has an L-shaped hook shape. In this manner, the eaves part 48 has a shape which bumps against the electric motor housing 20 b in a connection release direction of the housing 20 (the axial direction of the rotating shaft 24 shown in FIG. 3). Specifically, the eaves part 48 has a shape which bumps against the flange portion 20 b 1 of the electric motor housing 20 b.

Subsequently, the disassembly work and the assembly work of the turbo compressor 5 having the above-described configuration will be described with reference to FIGS. 7A, 7B, and 7C.

First, the disassembly work of the turbo compressor 5 will be described.

In the disassembly work of the turbo compressor 5, the turbo compressor 5 is disassembled in the order of FIG. 7A, FIG. 7B, and FIG. 7C.

Here, the external manifold 38 is mounted on the compressor housing 20 a. Further, the cover member 40 through which the lubricant spray nozzle 39 supported on the external manifold 38 penetrates is mounted on the electric motor housing 20 b. In this manner, in a case where the lubricant spray nozzle 39 is disposed to penetrate the cover member 40, if an attempt to separate the housing 20 is made in this state, there is a case where the lubricant spray nozzle 39 is broken (refer to FIG. 7A).

For this reason, in this embodiment, the eaves part 48 is provided at the external manifold 38 and covers the head portion 46 a of the bolt 46 connecting the compressor housing 20 a and the electric motor housing 20 b, whereby it becomes necessary to remove the lubricant spray nozzle 39 from the cover member 40 before separation of the housing 20. As shown in FIG. 5, one among the bolts 46 is disposed on the back side of the eaves part 48 provided at the external manifold 38, and thus it is not possible to access the head portion 46 a for a screwdriver. Therefore, if the external manifold 38 is not removed, the bolt 46 cannot be removed by a tool 100 (refer to FIG. 7A). In this manner, in this embodiment, if the lubricant spray nozzle 39 is not removed from the cover member 40, the electric motor housing 20 b cannot be removed from the compressor housing 20 a, and therefore, it is possible to prevent breaking of the lubricant spray nozzle 39.

Further, in this embodiment, the eaves part 48 has a hook shape which bumps against the electric motor housing 20 b in the connection release direction of the housing 20. Therefore, in a case where an attempt is made to separate the housing 20 in a state where the lubricant spray nozzle 39 is not removed, the eaves part 48 bumps against the electric motor housing 20 b. For this reason, in this embodiment, due to the impact of the eaves part 48, it is possible to remind a worker that the lubricant spray nozzle 39 has not been removed from the cover member 40, and thus it is possible to more reliably prevent breaking of the lubricant spray nozzle 39.

As shown in FIG. 7B, after the lubricant spray nozzle 39 is removed from the cover member 40 and the housing 20, the bolt 46 having been disposed on the back side of the eaves part 48 is turned by the tool 100, whereby the connection of the compressor housing 20 a and the electric motor housing 20 b is released.

Then, if the fastening of all the bolts 46 is released, it is possible to separate the housing 20 into the compressor housing 20 a and the electric motor housing 20 b, as shown in FIG. 7C.

By the above, the disassembly work of the turbo compressor 5 is completed.

Next, the assembly work of the turbo compressor 5 will be described.

In the assembly work of the turbo compressor 5, the turbo compressor 5 is assembled in the order of FIG. 7C, FIG. 7B, and FIG. 7A. That is, the turbo compressor 5 is assembled by following the reversed procedure of that of the disassembly work.

First, as shown in FIG. 7C, the compressor housing 20 a and the electric motor housing 20 b are made to face each other. Next, as shown in FIG. 7B, the compressor housing 20 a and the electric motor housing 20 b are connected by the plurality of bolts 46. Finally, as shown in FIG. 7A, the lubricant spray nozzle 39 is installed by inserting the lubricant spray nozzle 39 from the outside to the inside of the housing 20.

By the above, the assembly work of the turbo compressor 5 is completed.

In this embodiment, the lubricant spray nozzle 39 is installed by making the lubricant spray nozzle 39 be supported on the external manifold 38 which is detachably mounted on the outside of the housing 20, and inserting the lubricant spray nozzle 39 from the outside to the inside of the housing 20. In this manner, in this embodiment, the installation of the lubricant spray nozzle 39 can be completed only by inserting the lubricant spray nozzle 39 from the outside of the housing 20, and therefore, labor required for the assembly of the oil feeding system of the turbo compressor 5 can be reduced.

Further, in this embodiment, the lubricant spray nozzle 39 is installed by providing the through-hole 43 in the cover member 40 which covers the large-diameter gear 29 or the bearing 26 in the interior of the housing 20, and inserting the lubricant spray nozzle 39 into the through-hole 43. In this manner, in this embodiment, the through-hole 43 is provided in the cover member 40 in advance, whereby the installation of the lubricant spray nozzle 39 can be completed only by inserting the lubricant spray nozzle 39 from the outside of the housing 20.

Further, the lubricant spray nozzle 39 is supported on the external manifold 38 which branches the oil supply passage. In this manner, the external manifold 38 also serves as a support member of the lubricant spray nozzle 39, whereby the number of parts can be reduced and the oil feeding system is simplified, thereby contributing to a reduction in costs. Further, if the oil feeding system is simplified, the pressure loss decreases, and therefore, the load which is applied to the oil feed pump 37 is reduced, and thus it is possible to favorably supply the lubricant to the bearing 26 by spraying the lubricant from the lubricant spray nozzle 39, as shown in FIG. 3.

As in this embodiment, if a spray direction of the lubricant is bent at the nozzle portion 45, the nozzle portion 45 receives a spray reaction force. In this embodiment, the nozzle portion 45 which receives the spray reaction force is formed to weigh less than the body pipe portion 44, and therefore, it is possible to reduce the generation of vibration due to the spray reaction force and thus appropriately supply the lubricant to the bearing 26. Further, the lubricant spray nozzle 39 is supported in the through-hole 43 of the cover member 40 at an intermediate point thereof, and therefore, the supply position of the lubricant is prevented from being shifted by the spray reaction force, and thus it is possible to accurately supply the lubricant to the bearing 26.

In this manner, according to this embodiment described above, the turbo compressor 5 is adopted which has the lubricant spray nozzle 39 which is disposed to penetrate the housing 20 and sprays the lubricant toward the bearing 26 accommodated in the housing 20, and the external manifold 38 which is detachably mounted on the housing 20 and supports the lubricant spray nozzle 39 outside of the housing 20. For this reason, the labor required for the assembly of the oil feeding system can be reduced, and it is possible to attain a reduction in costs and a reduction in pressure loss.

The preferred embodiment of the present invention has been described above with reference to the drawings. However, the present invention is not limited to the embodiment described above. The shapes, the combination, or the like of the respective constituent members shown in the embodiment described above is one example and various changes can be made based on design requirements or the like within a scope of the present invention.

For example, the present invention can adopt the form shown in FIG. 8. In addition, in the following description, constituent portions equal or equivalent to those in the embodiment described above are denoted by the same reference numerals and a description thereof is simplified or omitted.

FIG. 8 is a sectional view showing the lubricant spray nozzle 39 in another embodiment of the present invention.

As shown in FIG. 8, in the lubricant spray nozzle 39 in another embodiment, the body pipe portion 44 and the nozzle portion 45 are joined to each other by a screw portion 52. According to this configuration, the body pipe portion 44 and the nozzle portion 45 can be formed of different materials (for example, the body pipe portion 44 is made of steel and the nozzle portion 45 is made of aluminum). In this manner, the nozzle portion 45 is formed of a material having smaller specific gravity that the body pipe portion 44, whereby a head of the lubricant spray nozzle 39 weighs less, and thus it is possible to reduce the generation of vibration due to the spray reaction force and thus appropriately supply the lubricant to the bearing 26.

Further, for example, in the above-described embodiment, a configuration has been described in which the sliding site to which the lubricant spray nozzle 39 sprays the lubricant is the bearing 26. However, the present invention is not limited to this configuration, and the bearings 21, 27, or 31, or the like may be set as the sliding sITE.

INDUSTRIAL APPLICABILITY

According to the present invention, a turbo compressor and a turbo refrigerating machine are obtained in which labor required for the assembly of an oil feeding system can be reduced.

REFERENCE SIGNS LIST

1: turbo refrigerating machine

2: condenser

4: evaporator

5: turbo compressor

20: housing

20 a: compressor housing

20 b: electric motor housing

26: bearing (sliding site)

38: external manifold (support member, lubricant manifold)

39: lubricant spray nozzle

40: cover member

43: through-hole

44: body pipe portion

45: nozzle portion

46: bolt

46 a: head portion

48: eaves part

R7: oil supply passage 

1. A turbo compressor comprising: a lubricant spray nozzle which is disposed to penetrate a housing and sprays a lubricant toward a sliding site accommodated in the housing; a support member which is detachably mounted on the housing and supports the lubricant spray nozzle outside of the housing; and a cover member which covers the sliding site in the interior of the housing and has a through-hole, wherein the lubricant spray nozzle is disposed to pass through the through-hole.
 2. The turbo compressor according to claim 1, wherein the housing is configured by connecting a compressor housing on which the support member is mounted and an electric motor housing on which the cover member is mounted, by a plurality of bolts, and the support member is provided with an eaves part which covers a head portion of at least one bolt among the plurality of bolts when the support member is mounted on the compressor housing.
 3. The turbo compressor according to claim 2, wherein the eaves part has a hook shape and bumps against the electric motor housing in a connection release direction of the housing.
 4. The turbo compressor according to claim 1, wherein the support member is a lubricant manifold having an oil supply passage which communicates with at least the lubricant spray nozzle.
 5. The turbo compressor according to claim 1, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion weighs less than the body pipe portion.
 6. The turbo compressor according to claim 1, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion is formed of a material having smaller specific gravity than the body pipe portion.
 7. A turbo refrigerating machine comprising: a condenser which liquefies a compressed refrigerant; an evaporator which evaporates the refrigerant liquefied by the condenser, thereby cooling a cooling object; and the turbo compressor according to claim 1, which compresses the refrigerant evaporated by the evaporator and supplies the compressed refrigerant to the condenser.
 8. The turbo compressor according to claim 2, wherein the support member is a lubricant manifold having an oil supply passage which communicates with at least the lubricant spray nozzle.
 9. The turbo compressor according to claim 3, wherein the support member is a lubricant manifold having an oil supply passage which communicates with at least the lubricant spray nozzle.
 10. The turbo compressor according to claim 2, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion weighs less than the body pipe portion.
 11. The turbo compressor according to claim 3, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion weighs less than the body pipe portion.
 12. The turbo compressor according to claim 4, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion weighs less than the body pipe portion.
 13. The turbo compressor according to claim 2, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion is formed of a material having smaller specific gravity than the body pipe portion.
 14. The turbo compressor according to claim 3, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion is formed of a material having smaller specific gravity than the body pipe portion.
 15. The turbo compressor according to claim 4, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion is formed of a material having smaller specific gravity than the body pipe portion.
 16. The turbo compressor according to claim 5, wherein the lubricant spray nozzle is provided with a body pipe portion which is disposed to penetrate the housing, and a nozzle portion which is connected to an end portion of the body pipe portion, and the nozzle portion is formed of a material having smaller specific gravity than the body pipe portion. 